I think MPG and TQ are in the cards with the roller and P heads. If you go with the 289 Hi_Po Re-popped exhaust, as Fletch and myself did, you will maintain a vintage look and most folks would never know a 260 from a 5.0 anyway. But the MPG and even TQ needs a well matched OD tranny and depending of the Fords weight the right rear gears. JMO
1978 Ranchero GT 351W C6
1979 Ranchero GT 5.0 HO, AOD w/98 guts, 3.50 9" Traction-Lok
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Salt is for steaks-- Not roads!
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